File Extension PTT File Format Pro Tools session template PTT stands for Pro Tools session template. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Triggers Triggers Can I locate .PST files in Outlook and verify the associated profile?